docs(idf_py): Describe the option to configure esptool.py with --extra-args

docs/en/api-guides/tools/idf-py.rst

@@ -120,6 +120,8 @@ This command automatically builds the project if necessary, and then flash it to
 
 .. note:: The environment variables ``ESPPORT`` and ``ESPBAUD`` can be used to set default values for the ``-p`` and ``-b`` options, respectively. Providing these options on the command line overrides the default.
 
+``idf.py`` uses the ``write_flash`` command of ``esptool.py`` under the hood to flash the target. You can pass additional arguments to configure the flash writing process using the ``--extra-args`` option. For example, to `write to an external SPI flash chip <https://docs.espressif.com/projects/esptool/en/latest/esptool/advanced-options.html#custom-spi-pin-configuration>`_, use the following command: ``idf.py flash --extra-args="--spi-connection <CLK>,<Q>,<D>,<HD>,<CS>"``. To see the full list of available arguments, run ``esptool.py write_flash --help`` or see the `esptool.py documentation <https://docs.espressif.com/projects/esptool/en/latest/esptool/index.html>`_.
+
 Similarly to the ``build`` command, the command can be run with ``app``, ``bootloader`` and ``partition-table`` arguments to flash only the app, bootloader or partition table as applicable.
 
 Hints on How to Resolve Errors

docs/en/api-reference/storage/spiffs.rst

@@ -85,6 +85,10 @@ To flash the image onto {IDF_TARGET_NAME} at offset 0x110000, run::
 
     python esptool.py --chip {IDF_TARGET_PATH_NAME} --port [port] --baud [baud] write_flash -z 0x110000 spiffs.bin
 
+.. note::
+
+    You can configure the ``write_flash`` command of ``esptool.py`` to `write the spiffs data to an external SPI flash chip <https://docs.espressif.com/projects/esptool/en/latest/esptool/advanced-options.html#custom-spi-pin-configuration>`_ using the ``--spi-connection <CLK>,<Q>,<D>,<HD>,<CS>`` option. Just specify the GPIO pins assigned to the external flash, e.g. ``python esptool.py write_flash --spi-connection 6,7,8,9,11 -z 0x110000 spiffs.bin``.
+
 Notes on which SPIFFS tool to use
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

docs/zh_CN/api-guides/tools/idf-py.rst

@@ -120,6 +120,8 @@ ESP-IDF 支持多个目标芯片，运行 ``idf.py --list-targets`` 查看当前
 
 .. note:: 环境变量 ``ESPPORT`` 和 ``ESPBAUD`` 可分别设置 ``-p`` 和 ``-b`` 选项的默认值，在命令行上设置这些选项的参数可覆盖默认值。
 
+``idf.py`` 在内部使用 ``esptool.py`` 的 ``write_flash`` 命令来烧录目标设备。通过 ``--extra-args`` 选项传递额外的参数，并配置烧录过程。例如，要 `写入到外部 SPI flash 芯片 <https://docs.espressif.com/projects/esptool/en/latest/esptool/advanced-options.html#custom-spi-pin-configuration>`_，请使用以下命令： ``idf.py flash --extra-args="--spi-connection <CLK>,<Q>,<D>,<HD>,<CS>"``。要查看所有可用参数，请运行 ``esptool.py write_flash --help`` 或查看 `esptool.py 文档 <https://docs.espressif.com/projects/esptool/en/latest/esptool/index.html>`_。
+
 与 ``build`` 命令类似，使用 ``app``、``bootloader`` 或 ``partition-table`` 参数运行此命令，可选择仅烧录应用程序、引导加载程序或分区表。
 
 错误处理提示

docs/zh_CN/api-reference/storage/spiffs.rst

@@ -85,6 +85,10 @@ mkspiffs
 
     python esptool.py --chip {IDF_TARGET_PATH_NAME} --port [port] --baud [baud] write_flash -z 0x110000 spiffs.bin
 
+.. note::
+
+    通过 ``--spi-connection <CLK>,<Q>,<D>,<HD>,<CS>`` 选项，可以配置 ``esptool.py`` 的 ``write_flash`` 命令，从而 `将 spiffs 数据写入外部 SPI flash 芯片 <https://docs.espressif.com/projects/esptool/en/latest/esptool/advanced-options.html#custom-spi-pin-configuration>`_。只需指定分配给外部 flash 的 GPIO 管脚，如 ``python esptool.py write_flash --spi-connection 6,7,8,9,11 -z 0x110000 spiffs.bin``。
+
 选择合适的 SPIFFS 工具
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~